package com.xinan.utils;

import java.security.SecureRandom;
import java.util.UUID;

/**
 * 封装各种生成唯一性ID算法的工具类.
 * 
 * @author Wang
 */
public class Identities {

	private static SecureRandom random = new SecureRandom();

	private Identities() {
	}

	/**
	 * 封装JDK自带的UUID, 通过Random数字生成,中间有-分割
	 */
	public static String uuid() {
		return UUID.randomUUID().toString();
	}

	/**
	 * 封装JDK自带的UUID, 通过Random数字生成,中间无-分割
	 */
	public static String uuid2() {
		return UUID.randomUUID().toString().replaceAll("-", "");
	}

	/**
	 * 使用SecureRandom随机生成Long. 
	 */
	public static long randomLong() {
		return random.nextLong();
	}
	public static void main(String[] args){
		System.out.println(Identities.uuid2().length());
	}
}
